Probably not. Compressors don't fail that way. They don't lose performance by any significant amount.

Things that effect performance beyond incorrect charge amount are dirty condensor, dirty evaporator, too much oil in system, bad aux fan or controls, bad viscous clutch AND don't forget that the climate control controls the flow of coolant through the heater core to regulate temperature.

All that said, if you are taking these pressures and readings with the car sitting still, then they will vary. The key is enough air flow across the condensor. Driving down the road, this is no problem in most cases. In the shop with gauges and thermometers in place OTOH unless you have a high flow shop fan in front of the radiator and the idle set to about 1,500 RPM, it's difficult to check pressures and temps.

Good luck with it.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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